svm_msg_q_lock (mq);
while (svm_msg_q_is_full (mq)
|| svm_msg_q_ring_is_full (mq, ring_index))
- svm_msg_q_wait (mq, SVM_MQ_WAIT_FULL);
+ svm_msg_q_wait_prod (mq);
*msg = svm_msg_q_alloc_msg_w_ring (mq, ring_index);
}
return 0;
if (nowait)
return (-2);
while (svm_msg_q_is_full (mq))
- svm_msg_q_wait (mq, SVM_MQ_WAIT_FULL);
+ svm_msg_q_wait_prod (mq);
}
svm_msg_q_add_raw (mq, (u8 *) msg);
if (mq->q.evtfd == -1)
{
- if (type == SVM_MQ_WAIT_EMPTY)
+ rv = pthread_mutex_lock (&mq->q.shr->mutex);
+ if (PREDICT_FALSE (rv == EOWNERDEAD))
{
- rv = pthread_mutex_lock (&mq->q.shr->mutex);
- if (PREDICT_FALSE (rv == EOWNERDEAD))
- {
- rv = pthread_mutex_consistent (&mq->q.shr->mutex);
- return rv;
- }
+ rv = pthread_mutex_consistent (&mq->q.shr->mutex);
+ return rv;
}
while (fn (mq))
pthread_cond_wait (&mq->q.shr->condvar, &mq->q.shr->mutex);
- if (type == SVM_MQ_WAIT_EMPTY)
- pthread_mutex_unlock (&mq->q.shr->mutex);
+ pthread_mutex_unlock (&mq->q.shr->mutex);
}
else
{
return 0;
}
+int
+svm_msg_q_wait_prod (svm_msg_q_t *mq)
+{
+ if (mq->q.evtfd == -1)
+ {
+ while (svm_msg_q_is_full (mq))
+ pthread_cond_wait (&mq->q.shr->condvar, &mq->q.shr->mutex);
+ }
+ else
+ {
+ u64 buf;
+ int rv;
+
+ while (svm_msg_q_is_full (mq))
+ {
+ while ((rv = read (mq->q.evtfd, &buf, sizeof (buf))) < 0)
+ {
+ if (errno != EAGAIN)
+ {
+ clib_unix_warning ("read error");
+ return rv;
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
int
svm_msg_q_timedwait (svm_msg_q_t *mq, double timeout)
{
/**
* Wait for message queue event
*
- * Must be called with mutex held. The queue only works non-blocking
- * with eventfds, so handle blocking calls as an exception here.
+ * When eventfds are not configured, the shared memory mutex is locked
+ * before waiting on the condvar. Typically called by consumers.
*/
int svm_msg_q_wait (svm_msg_q_t *mq, svm_msg_q_wait_type_t type);
+/**
+ * Wait for message queue event as producer
+ *
+ * Similar to @ref svm_msg_q_wait but lock (mutex or spinlock) must
+ * be held. Should only be called by producers.
+ */
+int svm_msg_q_wait_prod (svm_msg_q_t *mq);
+
/**
* Timed wait for message queue event
*
svm_msg_q_lock (mq);
while (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)
|| svm_msg_q_is_full (mq))
- svm_msg_q_wait (mq, SVM_MQ_WAIT_FULL);
+ svm_msg_q_wait_prod (mq);
msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
evt->session_index = session_index;